CONTROL APPARATUS FOR CONTROLLING GEAR CHANGE IN A COMBUSTION ENGINE VEHICLE SO AS TO ENSURE ECONOMICAL OPERATION OF RUNNING VEHICLE ENGINE

摘要

1. Control device for a vehicle driven by a motor by way of a transmission that preferably changes the transmission ratio in steps, which device has the following features : a) there is provided a store (36) recording the characteristics of the motor for ascertaining the instantaneous driving torque MA delivered by the motor (6) ; b) there is provided a sensor (16) registering the number of revolutions per minute nR of at least one vehicle wheel (15) of which the output signal is fed to a differentiating device for ascertaining a magnitude 9s of acceleration derived from the variation with time of the number of revolution per minute nR of the vehicle wheel (15) ; c) there is provided a weight-assessment means (30) for calculating the weight of the vehicle from the instantaneous driving torque MA and the magnitude s of acceleration. d) there is provided a torque-control device (24) for calculating a steady torque MSTAT , which is necessary for driving the vehicle without acceleration, from the instantaneous torque MA , the vehicle weight G and the magnitude 9s of acceleration ; e) there is provided a transmission-control means (18) with comparison device (45, 47) which compare the steady torque MSTAT with torque limiting lines (65, 63) which have been determined on the basis of economy factors, and a control signal for a change in gear is released if the steady torque MSTAT does not lie within the economy range included by the limiting lines (65, 63).